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{{ImportantMessage|text=As the structure of the BELK/BXELK is based on several tools, it is strongly recommended the reading of [[Logical_structure_of_Bora_and_BoraX_Embedded_Linux_Kits_(BORA_SOM/BELK-L/General/BXELK)Logical_structure_of_BELK|this document]] first to get an overview.
}}
BELK/BXELK provides one (or more) pre-built root file system, that can be used during the evaluation/development/deployment cycle. For instance, the root file system included in the <code>bora-image-devel</code> image is suited for the development phase, since it provides a relatively rich set of packages including tools and libraries used to debug the application code. The pre-built root file systems are located here: <code>/home/dvdk/<target_name>/rfs/<kit_name></code>.
Besides the pre-built root file systems, BELK/BXELK also provides a rich repository containing pre-built applications and libraries. These packages can be easily installed on the target by using the <code>smart</code> tool. Please refer to [[Advanced_use_of_Yocto_build_system_(BORA_SOM/BELK-L/Development/BXELK)Advanced_use_of_Yocto_build_system#Using_pre-built_package_archive|this section]] for more details.
To generate the supported root file systems, the build of the Yocto BSP has to be run. The output of this process is an image containing the U-Boot binary file, the Linux kernel image, and the selected root file system image. The following sections describe in detail how to execute this operation.
{{ImportantMessage|text=This process requires a lot of hardware resources in terms of disk storage, RAM, and processing power. For this reason, it also is recommended to consider the use of a physical machine. For more details on this topic, please refer to [[Advanced_use_of_Yocto_build_system_(BORA_SOM/BELK-L/Development/BXELK)Advanced_use_of_Yocto_build_system|this document]] which talks about the advanced use of the Yocto build system.}}
==== Initialize the build environment ====
BELK/BXELK Yocto BSP uses [https://code.google.com/p/git-repo/ git-repo] tool to fetch all the required git repositories. To install it, please use the following commands:
<pre class="workstation-terminal">
dvdk@dvdk-vm:~/belk$ curl http://commondatastorage.googleapis.com/git-repo-downloads/repo -1 > repo
dvdk@dvdk-vm:~/belk$ chmod a+x repo
dvdk@dvdk-vm:~/belk$ ./repo init -u git@git.dave.eu:bora/bora-bsp.git -b bora-morty
dvdk@dvdk-vm:~/belk$ source bora-bsp-init-env.sh
</pre>
===== unauthenticated git protocol error =====
{{ImportantMessage|text=Since March 15th, 2022, GitHub stopped accepting DSA keys. RSA keys uploaded after Nov 2, 2021 will work only with SHA-2 signatures.
The deprecated MACs, ciphers, and unencrypted Git protocol are permanently disabled.<br>For more details on this topic, please refer to [[MISC-TN-015:_Yocto_and_git_protocol_error|this Technical Note]].}}
==== Running the build ====